Seawater uranium extraction composite adsorption material, preparation method and application

Abstract

This disclosure provides a seawater uranium extraction composite adsorbent material, its preparation method, and its application. The preparation method of the seawater uranium extraction composite adsorbent material includes: coating a pretreated polymer film with a coating liquid to obtain a modified polymer film; and post-treating the modified polymer film to obtain the seawater uranium extraction composite adsorbent material. The coating liquid includes a metallo-oxime-based material, a hydrophilic polymer material, a plasticizer, a crosslinking agent, and a pore-forming agent.

Description

Technical Field

[0001] This disclosure relates to the technical field of composite adsorption materials, and in particular to a seawater uranium extraction composite adsorption material, its preparation method, and its application. Background Technology

[0002] Uranium is the foundation and strategic resource for the sustainable development of the nuclear industry, playing a crucial role in nuclear power, nuclear energy development, and national defense security. However, terrestrial uranium resources are scarce, and there is a serious gap in uranium fuel self-sufficiency, which adversely affects ensuring national energy security and maintaining economic stability. The ocean is a vast uranium reservoir, with large amounts of dissolved uranium in seawater. If uranium resources in seawater can be effectively enriched, it will become an important supplement and guarantee for a stable fuel supply for nuclear power. However, the uranium concentration in seawater is low, and the performance and mass production of adsorbent materials for uranium extraction from seawater are crucial factors determining the economic viability of seawater uranium extraction.

[0003] Therefore, researching and developing high-performance seawater uranium extraction adsorbents and their engineered preparation is a technological prerequisite for improving the economics of seawater uranium extraction and realizing its industrialization. Summary of the Invention

[0004] To address the aforementioned technical problems, this disclosure provides a seawater uranium extraction composite adsorbent material, its preparation method, and its application, aiming to at least partially solve the technical problems mentioned above.

[0005] To solve the above-mentioned technical problems, the technical solution provided in this disclosure is as follows:

[0006] As one aspect of this disclosure, a method for preparing a seawater uranium extraction composite adsorbent material is provided, comprising:

[0007] The pretreated polymer film is coated with a coating solution to obtain a modified polymer film.

[0008] The modified polymer film was post-processed to obtain a seawater uranium extraction composite adsorbent material.

[0009] The coating liquid includes a amine oxime-based material, a hydrophilic polymer material, a plasticizer, a crosslinking agent, and a pore-forming agent.

[0010] In one embodiment, the pretreatment method includes: introducing cross-linking groups into the polymer film after plasma and / or corona treatment, followed by washing with water and drying;

[0011] The coating methods include any one or more of gravure roller coating, dip coating, narrow coating, or spray coating;

[0012] The post-processing includes heat treatment, drying, washing, and drying again.

[0013] In one embodiment, the amylopyram-based material is obtained by hydroxylating modification of a cyano polymer.

[0014] In one embodiment, the form of the amylopyroxime-based material includes any one of a slurry, suspension, or solution, and the concentration of the amylopyroxime-based material is preferably 0.001-5 g / mL.

[0015] In one embodiment, the coating liquid comprises, by weight parts:

[0016] 35-55 parts of a methylamine oxime-based material;

[0017] 50-150 parts of hydrophilic polymer material;

[0018] 5-40 parts plasticizer;

[0019] 1-18 parts of crosslinking agent;

[0020] 5-30 parts of pore-forming agent.

[0021] In one embodiment, the hydrophilic polymer material includes any one or more of polyacrylic acid, polyacrylamide, or polymethacrylic acid;

[0022] Plasticizers include any one or more of glycerol, polyvinyl alcohol, polyethylene glycol, polyethylene oxide, or polyacrylamide;

[0023] Crosslinking agents include any one or more of glutaraldehyde, acetic anhydride, diglycidyl glycerol ether, or octyldiimide methyl ester;

[0024] The pore-forming agent includes any one or more of lithium carbonate, lithium chloride, ammonium bicarbonate, polyethylene glycol, polyvinyl alcohol, or polyvinylpyrrolidone.

[0025] In one embodiment, the method for preparing the polymer film includes any one of biaxial stretching, blow molding, or casting;

[0026] The polymer film preferably includes any one or more of biaxially oriented polyethylene film, biaxially oriented polypropylene film, biaxially oriented polyester film, or biaxially oriented polyamide film.

[0027] As another aspect of this disclosure, a seawater uranium extraction composite adsorbent prepared by the above-described method is provided, comprising, from top to bottom:

[0028] Top surface coating layer;

[0029] Intermediate polymer film layer;

[0030] And, the lower surface coating layer.

[0031] In one embodiment,

[0032] The thickness of the coating layer on the upper surface is 0.5-10 μm;

[0033] The thickness of the intermediate polymer film layer is 3-50 μm;

[0034] The thickness of the coating layer on the lower surface is 0.5-10 μm.

[0035] As another aspect of this disclosure, an application of the above-mentioned seawater uranium extraction composite adsorbent material in ion adsorption is provided.

[0036] Based on the above technical solution, the seawater uranium extraction composite adsorbent material, preparation method, and application provided in this disclosure involve coating a metallo-oxime-based material with a polymer film and cross-linking them to form a composite film layer with a three-dimensional network structure, thus obtaining a seawater uranium extraction composite material. The metallo-oxime groups can enrich uranium by chelating with uranyl ions in seawater. The coating method prevents the metallo-oxime groups from being directly grafted onto the polymer film. Compared with in-situ treatment of the polymer film to graft metallo-oxime groups, this method better preserves the excellent mechanical properties of the polymer film, achieves high strength of the composite material, and thus improves the service life of the seawater uranium extraction composite adsorbent material. Furthermore, the method has a simple process flow, can be improved based on existing polymer film production lines, is easy to engineer, and has the prospect of large-scale application. Attached Figure Description

[0037] Figure 1 This is a flowchart illustrating the preparation of the seawater uranium extraction composite adsorbent material in this embodiment of the present disclosure. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0039] Currently, functional polymers modified with a methylamine oxime group (H₂N-C=N-OH) are considered promising adsorbents for uranium extraction from seawater due to the chelating ability of the methylamine oxime group with uranium ions in seawater. However, in developing this disclosure, it was discovered that while electrospinning can achieve continuous production of methylamine oxime-modified functional polymers, the limitations imposed by the porosity, size uniformity, and collection thickness of the micro / nanofibers, coupled with safety concerns related to the high-voltage electrostatic field production process, hinder the large-scale widespread production of engineered adsorbents. Furthermore, while methylamine oxime gels exhibit superior adsorption performance, their preparation process is relatively complex, making mass production and engineering difficult.

[0040] In view of the technical problems existing in the related technologies, this disclosure provides a seawater uranium extraction composite adsorbent material, preparation method and application. By coating a metallo-oxime-based material with a polymer film, a seawater uranium extraction composite material is obtained. The composite material retains the excellent mechanical properties of the polymer film and can achieve high-efficiency adsorption in the seawater uranium extraction process. The process is simple and easy to implement and can be prepared based on existing polymer film production lines, making it suitable for mass production.

[0041] Specifically, as one aspect of this disclosure, a method for preparing a seawater uranium extraction composite adsorbent material is provided. Figure 1 The flowchart for preparing the seawater uranium extraction composite adsorbent material in this embodiment includes steps S101 to S102:

[0042] Step S101: The pretreated polymer film is coated with a coating solution to obtain a modified polymer film;

[0043] Step S102: Post-process the modified polymer film to obtain the seawater uranium extraction composite adsorbent material.

[0044] According to embodiments of this disclosure, the coating liquid includes a metallo-oxime-based material, a hydrophilic polymer, a plasticizer, a crosslinking agent, and a pore-forming agent. The hydrophilic polymer includes any one or more of polyacrylic acid, polyacrylamide, or polymethacrylic acid; the plasticizer includes any one or more of glycerol, polyvinyl alcohol, polyethylene glycol, polyethylene oxide, or polyacrylamide; the crosslinking agent includes any one or more of glutaraldehyde, acetic anhydride, diglycidyl ether, or octyldiimide methyl ester; and the pore-forming agent includes any one or more of lithium carbonate, lithium chloride, ammonium bicarbonate, polyethylene glycol, polyvinyl alcohol, or polyvinylpyrrolidone. When the pore-forming agent and the plasticizer are the same substance (e.g., polyvinyl alcohol, polyethylene glycol), they do not need to be added repeatedly; this substance acts as both a plasticizer and a pore-forming agent in the coating liquid.

[0045] According to embodiments of this disclosure, the polymer film includes any one or more of biaxially oriented polyethylene film, biaxially oriented polypropylene film, biaxially oriented polyester film, or biaxially oriented polyamide film. The impact strength and flexural strength of the biaxially oriented polymer film are increased, and it serves as a carrier skeleton for the amine oxime-based material, thereby improving the strength of the composite material. Its preparation method includes any one of biaxial stretching, blow molding, or casting.

[0046] According to embodiments of this disclosure, the preparation method of the seawater uranium extraction composite adsorbent material is described in detail, and may specifically include:

[0047] In step S101, the polymer film is subjected to plasma and / or corona treatment to introduce cross-linking groups, and then washed and dried to obtain a pretreated polymer film. The pretreated polymer film is then coated with a coating solution to obtain a modified polymer film.

[0048] The coating liquid can be applied by any one or more of the following methods: gravure roller coating, dip coating, narrow coating, or spray coating. The coating combination can include a combination of gravure roller coating and dip coating, a combination of dip coating and narrow coating, or a combination of narrow coating and spray coating. There are no restrictions on the combination form.

[0049] In step S102, the modified polymer film is heat-treated to cross-link the coating liquid with the surface of the polymer film. It is then dried at 60-120℃ for 0.5-24h, washed with water to remove surface impurities and unfixed substances, and dried again at 60-120℃ for 0.5-24h.

[0050] According to embodiments of this disclosure, during the pretreatment process, the fiber surface is bombarded by high-energy particles through plasma and / or corona treatment to generate low-temperature plasma, which causes the molecular bonds on the fiber surface to break, generating many different free radicals and unsaturated centers on the material surface. These shallow surface free radicals and unsaturated centers then crosslink with water adsorbed in the air on the surface, thereby forming polar groups such as carbonyl and hydroxyl groups on the fiber surface, activating the fiber surface, introducing hydroxyl active groups onto the polymer film, and enhancing the surface polarity.

[0051] The power of plasma treatment ranges from 5 to 100W, for example, 5W, 8W, 20W, 50W, 80W, or 100W; the power of corona treatment ranges from 600 to 1200W, for example, 600W, 700W, 800W, 900W, 1000W, 1100W, or 1200W; the roller speeds for plasma and / or corona treatments range from 5 to 200 mm / s, for example, 5mm / s, 20mm / s, 50mm / s, 100mm / s, 150mm / s, or 200mm / s; and the treatment temperature ranges from 10 to 50℃, for example, 10℃, 20℃, 30℃, 40℃, or 50℃.

[0052] In the process of introducing crosslinking groups, the polymer film treated with plasma and / or corona is subjected to crosslinking agent treatment in a solution containing a crosslinking agent. The type of crosslinking agent is any one or more of glutaraldehyde, acetic anhydride, diglycidyl ether, or octyl diimine methyl ester, with a concentration of 0.5-10 wt% and a treatment time of 5-120 min. The type of crosslinking agent can be the same as or different from the type of crosslinking agent in the coating solution. The hydroxyl groups on the polymer film react with the functional groups in the crosslinking agent to introduce crosslinking groups, thereby achieving the composite of the amylopectin group and the polymer film and achieving a better coating effect.

[0053] According to embodiments of this disclosure, the cyano-based material is obtained by hydroxylating modification of a cyano polymer, specifically by reacting it with a cyano compound to form a cyano-based oxime. The cyano compounds include hydroxylamine hydrochloride, hydroxylamine sulfate, hydroxylamine nitrate, hydroxylamine oxalate, hydroxylamine phosphate, etc., and the cyano polymers include polyacrylonitrile, acrylonitrile copolymers (such as styrene-acrylonitrile copolymers, butadiene-acrylonitrile copolymers), etc.

[0054] According to embodiments of this disclosure, the modification of cyano polymers by hydroxylation is a amine oxime reaction. The pH of the amine oxime reaction is 5-10, for example, it can be 5, 6, 7, 8, 9 or 10, etc. The amine oxime reaction can also be carried out under weakly acidic conditions, and the pH can be adjusted by adding NaOH, KOH, Na2CO3, etc. The reaction temperature is 40-80℃, for example, it can be 40℃, 50℃, 60℃, 70℃ or 80℃, etc. The reaction time is 3-36h, for example, it can be 3h, 9h, 12h, 18h, 24h or 36h. The parameters are not limited to the listed values, and other unlisted values ​​within the range are also applicable.

[0055] The form of the metallo-oxime-based material includes any one of slurry, suspension or solution, and the concentration of the metallo-oxime-based material is preferably 0.001-5 g / mL, for example, 0.001 g / mL, 0.01 g / mL, 0.1 g / mL, 1 g / mL, 2 g / mL, 3 g / mL, 4 g / mL or 5 g / mL.

[0056] According to embodiments of this disclosure, the coating liquid comprises, by weight parts:

[0057] 35-55 parts of a amine oxime-based material, such as 35 parts, 40 parts, 45 parts, 50 parts, 55 parts, etc.; 50-150 parts of hydrophilic polymer material, such as 50 parts, 60 parts, 80 parts, 100 parts, 120 parts, etc.; 5-40 parts of plasticizer, such as 5 parts, 15 parts, 20 parts, 30 parts, 40 parts, etc.; 1-18 parts of crosslinking agent, such as 1 part, 5 parts, 8 parts, 15 parts, 18 parts, etc.; 5-30 parts of pore-forming agent, such as 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, etc.

[0058] As another aspect of this disclosure, a seawater uranium extraction composite adsorbent prepared by the above-described method is provided, comprising, from top to bottom:

[0059] The upper surface coating layer has a thickness of 0.5-10 μm, for example, it can be 0.5 μm, 1 μm, 2 μm, 3 μm, 5 μm, 6 μm, 8 μm, 10 μm, etc., preferably 0.5-5 μm;

[0060] The intermediate polymer film layer has a thickness of 3-50 μm, for example, it can be 3 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, etc., preferably 3-20 μm;

[0061] Furthermore, the lower surface coating layer has a thickness of 0.5-10 μm, for example, it can be 0.5 μm, 1 μm, 2 μm, 3 μm, 5 μm, 6 μm, 8 μm, 10 μm, etc., preferably 0.5-5 μm. If the thickness of the upper and lower surface coating layers is too thick, the polyamine oximes will stack and mask each other, reducing the effective adsorption area and thus affecting the adsorption efficiency. Therefore, controlling the coating layer thickness improves the adsorption efficiency of uranium extraction from seawater.

[0062] According to embodiments of this disclosure, an application of a seawater uranium extraction composite adsorbent material in ion adsorption is provided.

[0063] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions and principles of this disclosure are further illustrated below with reference to specific embodiments and accompanying drawings. It should be noted that the specific embodiments described below are merely illustrative examples, and the scope of protection of this disclosure is not limited thereto.

[0064] Unless otherwise specified, all test materials and reagents used in the following examples are commercially available. Methods not specifically described in the examples are conventional and can be performed according to the techniques or conditions described in the literature or the product instructions.

[0065] Example 1

[0066] A method for preparing a seawater uranium extraction composite adsorbent material includes:

[0067] First, the coating solution was prepared: a slurry of a 2 g / mL amine oxime-based material was prepared by reacting polyacrylonitrile with hydroxylamine hydrochloride at pH 7 and temperature 70℃ for 18 h; the coating solution was obtained by mixing 45 parts of amine oxime-based material, 100 parts of polyacrylic acid, 15 parts of glycerol, 10 parts of glutaraldehyde and 23 parts of ammonium bicarbonate by mass fraction.

[0068] Biaxially oriented polyethylene (BEO) films prepared by biaxial stretching were subjected to plasma treatment at 20W power, 100mm / s roller speed, and 30℃. The films were then immersed in a solution containing a crosslinking agent (1wt% glutaraldehyde solution) for 30 min, washed with water, and dried at 80℃ for 4 h to obtain pretreated BEO films. These pretreated films were then coated with a coating solution, heat-treated at 95℃ for 3 h, washed with water, and dried at 95℃ for 3 h to obtain a seawater uranium extraction composite adsorbent. The seawater uranium extraction composite adsorbent consists of a 3μm thick upper surface coating layer, a 25μm thick intermediate polymer film layer, and a 3μm thick lower surface coating layer.

[0069] Example 2

[0070] A method for preparing a seawater uranium extraction composite adsorbent material includes:

[0071] First, the coating solution was prepared: a solution of a 0.5 g / mL amylopectin-based material was prepared by reacting polyacrylonitrile with hydroxylamine hydrochloride at pH 6.7 and temperature 65℃ for 24 h; the coating solution was obtained by mixing 35 parts of amylopectin-based material, 130 parts of polyacrylamide, 13 parts of polyvinyl alcohol, 15 parts of acetic anhydride and 28 parts of lithium carbonate by mass fraction.

[0072] Biaxially oriented polypropylene (BOPP) films prepared by biaxial stretching were subjected to corona treatment at a power of 900W, a roller speed of 50mm / s, and a temperature of 28℃. Following this treatment, the films were immersed in a solution containing a crosslinking agent (3wt% diglycidyl ether solution) for 20 minutes, washed with water, and dried at 80℃ for 4 hours to obtain pretreated BOPP films. These pretreated films were then coated with a narrow-coating solution, heat-treated at 95℃ for 3 hours, washed with water, and dried at 95℃ for 3 hours to obtain a seawater uranium extraction composite adsorbent. The seawater uranium extraction composite adsorbent consists of a 1.5μm thick upper surface coating layer, a 20μm thick intermediate polymer film layer, and a 2μm thick lower surface coating layer.

[0073] Comparative Example 1

[0074] A method for preparing a methylamine oxime-based polyethylene nanofiber membrane, comprising:

[0075] (1) Irradiate a polyethylene nanofiber membrane with a porosity of 60% in air at a dose rate of 20 kGy / h, with an absorbed dose of 120 kGy.

[0076] (2) The irradiated polyethylene nanofiber membrane was immersed in a solution containing acrylonitrile and acrylic acid, wherein the volume concentrations of acrylonitrile and acrylic acid were 50% and 10%, respectively, and nitrogen gas was introduced. The grafting reaction was carried out in a water bath at 60°C for 6 hours. After washing with DMF and water, the modified polyethylene nanofiber membrane was obtained by vacuum drying.

[0077] (3) The modified polyethylene nanofilm obtained in step (2) is immersed in a methanol / water solution containing 10wt% hydroxylamine hydrochloride at a volume ratio of 1:1 and reacted at 70°C for 4 hours at pH = 7.0. After the reaction is completed, the film sample is taken out of the solution, washed with water and vacuum dried to obtain the amylopectin-based polyethylene nanofiber membrane.

[0078] Mechanical properties were tested on the seawater uranium extraction composite adsorbent materials obtained in Examples 1 and 2 and the amylopectin-based polyethylene nanofiber membrane obtained in Comparative Example 1. The tensile strength (MPa) and elongation at break (%) were tested according to GB / T1040.3. The test results are shown in Table 1. It can be seen from the test results that the tensile strength and elongation at break of the seawater uranium extraction composite adsorbent material prepared in this embodiment are higher than those of the material obtained in the comparative example, and it has better mechanical strength.

[0079] Table 1 Performance Test Table of Composite Adsorption Materials

[0080]

[0081] In addition, the adsorption capacity of the seawater uranium extraction composite adsorbent materials prepared in Examples 1 and 2, and the amylopyridine-oxime-based polyethylene nanofiber membrane obtained in Comparative Example 1, was tested using simulated seawater conditions.

[0082] First, the materials obtained above were immersed in 1wt% KOH solution and subjected to alkaline activation treatment at 60℃ for 1.5h for deprotonation to improve the hydrophilicity of the materials, resulting in three alkaline-activated materials. Then, 1L of an aqueous solution containing 193mg NaHCO3 and 25.6g NaCl was prepared; next, 8mL of 1000ppm uranium standard solution was added to the aqueous solution to prepare 1L of 8ppm uranium standard simulated seawater; subsequently, saturated Na2CO3 solution and 2% HNO3 solution were added dropwise to adjust the pH to 8.0±0.1. 10mg of the alkaline-activated material was added to the above 1L of 8ppm uranium standard simulated seawater, and adsorption kinetics were studied in a constant temperature water bath shaker at 25℃ and 100rpm. The solution was adsorbed at specified time points, and the uranium concentration was tested and analyzed. The adsorption performance of the seawater uranium extraction composite adsorbent material for uranium was obtained using the following formula. Each experiment was repeated three times, and the average value was calculated:

[0083]

[0084] Among them, Q t To achieve the saturated adsorption capacity (mg / g) at adsorption equilibrium, C0 and C t The initial uranium concentration (mg / L) and the uranium concentration at adsorption equilibrium (g / L) are respectively, V is the volume of the adsorption solution (L), and m is the mass of the adsorbent (g).

[0085] Furthermore, the regeneration and reusability of the composite adsorbent materials prepared in Examples 1, 2, and Comparative Example 1 were evaluated by conducting continuous adsorption-desorption-regeneration cycle tests. Adsorption experiments were conducted in 1 L of simulated seawater containing 8 ppm uranium standard to reach adsorption equilibrium; desorption experiments were conducted in 0.5 mol / L HCl solution for 30 min; and regeneration experiments were conducted in 5 mmol / L KOH solution for 20 min. After washing with water, the materials were subjected to the next cycle of adsorption experiments. The uranium adsorption capacity at equilibrium after five repetitions was measured and compared with the uranium adsorption capacity at the initial simulated experiment to obtain the cycle stability of the three materials after five adsorption experiments.

[0086] As shown in Table 1, the seawater uranium extraction composite adsorbent prepared in this embodiment can achieve an adsorption capacity of approximately 240 mg / g in simulated seawater, while the adsorption capacity of the material prepared in the comparative example is only 137 mg / g. After five cycles, the seawater uranium extraction composite adsorbents in Examples 1 and 2 still maintain an adsorption capacity of over 92%. Irradiation and grafting methods reduce the mechanical properties of the material to some extent. This disclosure uses a coating method to composite the metallo-oxime-based material with a polymer film, resulting in a significant increase in the saturated adsorption capacity and cycle stability of the obtained seawater uranium extraction composite adsorbent. Furthermore, the coating method preserves the excellent mechanical properties of the polymer film.

[0087] The seawater uranium extraction composite adsorbent material, preparation method, and application provided in this disclosure involve coating a metallo-oxime-based material with a polymer film. This process preserves the excellent mechanical properties of the polymer film, thus ensuring the lifespan of the resulting seawater uranium extraction composite adsorbent material. The metallo-oxime groups can enrich uranium by chelating with uranyl ions in seawater, exhibiting high uranium adsorption performance. Furthermore, the material is recyclable, maintaining high adsorption efficiency even after five cycles. This preparation method is simple and easy to implement, suitable for industrial production, and meets the prospects for large-scale industrial applications.

[0088] The specific embodiments described above further illustrate the purpose, technical solutions, and beneficial effects of this disclosure. It should be understood that the above descriptions are merely specific embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A method for preparing a seawater uranium extraction composite adsorbent, comprising: The pretreated polymer film is coated with a coating solution to obtain a modified polymer film. The modified polymer film is post-treated by combining and cross-linking a metallo-oxime-based material with the polymer film to form a composite film layer with a three-dimensional network structure, thereby obtaining a seawater uranium extraction composite adsorbent material; the metallo-oxime-based material is obtained by hydroxylamine modification of a cyano polymer; wherein, the coating liquid includes a metallo-oxime-based material, a hydrophilic polymer material, a plasticizer, a cross-linking agent, and a pore-forming agent; The pretreatment method includes: introducing cross-linking groups into the polymer film after plasma and / or corona treatment, followed by washing with water and drying; The coating method includes any one or more of gravure roller coating, dip coating, narrow coating, or spray coating. The post-processing includes heat treatment, drying, water washing, and drying again in sequence; The method for preparing the polymer film includes biaxial stretching; The polymer film is selected from any one or more of biaxially oriented polyethylene film, biaxially oriented polypropylene film, biaxially oriented polyester film, or biaxially oriented polyamide film.

2. The preparation method according to claim 1, wherein, The metallo-oxime-based material is available in either a suspension or a solution, and the concentration of the metallo-oxime-based material is 0.001-5 g / mL.

3. The preparation method according to claim 1, wherein, The coating liquid comprises, by weight parts: 35-55 parts of the aforementioned amylopyroxime-based material; 50-150 parts of the aforementioned hydrophilic polymer material; 5-40 parts of the plasticizer; 1-18 parts of the crosslinking agent; 5-30 parts of the pore-forming agent.

4. The preparation method according to claim 1, wherein, The hydrophilic polymer material includes any one or more of polyacrylic acid, polyacrylamide, or polymethacrylic acid; The plasticizer includes any one or more of glycerol, polyvinyl alcohol, polyethylene glycol, polyethylene oxide, or polyacrylamide; The crosslinking agent includes any one or more of glutaraldehyde, acetic anhydride, diglycidyl ether, or octyldiimide methyl ester; The pore-forming agent includes any one or more of lithium carbonate, lithium chloride, ammonium bicarbonate, polyethylene glycol, polyvinyl alcohol, or polyvinylpyrrolidone.

5. A seawater uranium extraction composite adsorbent material prepared by the method according to any one of claims 1 to 4, comprising, from top to bottom: Top surface coating layer; Intermediate polymer film layer; And, the lower surface coating layer.

6. The seawater uranium extraction composite adsorbent material according to claim 5, wherein, The thickness of the coating layer on the upper surface is 0.5-10 μm; The thickness of the intermediate polymer film layer is 3-50 μm; The thickness of the coating layer on the lower surface is 0.5-10 μm.

7. The application of the seawater uranium extraction composite adsorbent material according to claim 5 or 6 in ion adsorption.

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